[1] In the wild, the plant is found growing only in shaded cracks on sandstone towers.

[2] Petunia exserta has a bright red corolla with distinctive exserted stamens and stigma, the latter which are typically associated with hummingbird pollination.

[3] The flowers have no fragrance, which is not necessary for attracting hummingbirds, who have little sense of smell.

[2] In addition to its very limited range, P. exserta is also threatened because it so easily hybridizes with other Petunia species in its native range, especially with Petunia axillaris, thus producing offspring that are hybrids rather than the species.

The plant is increasingly being sold in horticulture, so the threat to its survival is only in its native habitat.